Sounds like my wife and me. We are sober fifty days now.
No coke, but the pot and booze was really bad. The fights and violence DID stop when we quit.
There is a practical aspect -- how do you afford the coke? What's up with your job(s)? We are both unemployed, and the using was going to make us lose our home.
We are BOTH going to NA and AA meetings, almost every day. It is good to share meetings with my partner because there is a lot of drama and dogma, but we both have been to rehab and local meetings are the necessary follow-up.
Don't hesitate to call for help. Domestic violence counselors are very accustomed to substance abuse problems. Find SOMEONE to talk to.